a+λbâ¥bææå°±æ¯
(a+λb)b=0
a+λb=(1+2λ,2-2λ)
2(1+2λ)-2(2-2λ)=0
2+4λ-4+4λ=0
8λ-2=0
λ=1/4
c=(6,6)
b*c*a=[(2,-2)(6,6)](1,2)
=0
å 为bâ¥c
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